Nightscout XDrip

Hello good morning, I am trying to create the Nightcout page with Heroku, but every time I get to a part where I have to add a credit card, once everything is put and verified all the numbers and others, it always gives me error, I amAlready desperate, has it happened to someone and could have solved it?

Try another day.Maybe that server is performing some maintenance task

Thank you very much it and I tell you, au that yab I did it two different days,